US 9,811,229 B2
Capacitive touch sensing
Zhou Yi, Shanghai (CN); Zhang Jun, Shanghai (CN); Shen Ge, Shanghai (CN); Xu Kang Cheng, Shanghai (CN); Hao Meng, Shanghai (CN); and Ji Ru Jun, Shanghai (CN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Mar. 3, 2017, as Appl. No. 15/449,224.
Application 15/449,224 is a continuation of application No. 14/659,091, filed on Mar. 16, 2015, abandoned.
Application 14/659,091 is a continuation of application No. PCT/CN2014/091126, filed on Nov. 14, 2014.
Prior Publication US 2017/0177119 A1, Jun. 22, 2017
Int. Cl. G01R 27/26 (2006.01); G06F 3/044 (2006.01); G06F 3/041 (2006.01)
CPC G06F 3/044 (2013.01) [G06F 3/0416 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A touch sensor apparatus, comprising:
a grid of intersecting sensor lines, each intersection including a capacitor coupling together the intersecting sensor lines;
a plurality of input/output (IO) pins; and
a plurality of diodes, each diode coupled to a corresponding IO pin, wherein each IO pin couples through its corresponding diode to a channel of intersection points of the sensor lines and, without the diode, each IO pin couples to a different channel of intersecting points of the sensor lines; and
a processor coupled to the IO pins and configured to sequentially provide a transmit signal through each IO pin while detecting a response signal on the other IO pins.